2-way encryption for buffers

xorcrypt_buffer.gml

#macro ENCRIPTION_KEY "your-encryption-key"

function xorcrypt_buffer(_buff) {
	var _key = ENCRIPTION_KEY;
	var _key_len = string_byte_length(_key);
	var _size = buffer_get_size(_buff);
	
	// Iterate through the buffer and XOR every byte
	for (var i = 0; i < _size; i++) {
		var _byte = buffer_peek(_buff, i, buffer_u8);
		var _key_byte = string_byte_at(_key, (i % _key_len) + 1);
		
		buffer_poke(_buff, i, buffer_u8, _byte ^ _key_byte);
	}
}